Re: cp_compat_x_tst.o-cp_compat_y_tst.o testcase

3 msg	FAIL: gcc.target/i386/sse2-vec-5.c on gcc-4.2 b...
3 msg	libjava is broken
1 msg	gcc-4.2-20070620 is now available
4 msg	[tuples] Accessors for RHS of assignments
2 msg	Type system functions to their own file?
8 msg	[PATCH][RFC] Re-structure tree_ssa_useless_type...
13 msg	How to supress a specific kind of ansi-aliasing...
5 msg	libgcc fails to compile if DItype is not suppor...
3 msg	preventing -m options being passed to the compiler
22 msg	Type-punning
2 msg	class 3 edges
1 msg	scalar expansion and array privatization for lo...
3 msg	Where can I find 'sizeof' implementation in fro...
10 msg	Severe increase in compilation time with 4.3.0 ...
27 msg	m68k bootstrap problem

cp_compat_x_tst.o-cp_compat_y_tst.o testcase
\ Revital1 Eres (19 Jun 2007)
. \ Jakub Jelinek (19 Jun 2007)

1 msg	run-time function adaptation for statically-com...
5 msg	Object attribute tagging
9 msg	virtual stack regs.
1 msg	gcc-4.1-20070618 is now available

Subject:	Re: cp_compat_x_tst.o-cp_compat_y_tst.o testcase
Group:	Gcc
From:	Jakub Jelinek
Date:	19 Jun 2007

On Tue, Jun 19, 2007 at 04:26:46PM +0300, Revital1 Eres wrote:
> While testing a patch on current trunk (r 125640) I've noticed that g++'s
> cp_compat_x_tst.o-cp_compat_y_tst testcase fails with unexpected failure
> on x86_64 with the vanilla version but passes OK with the patched version
> (-O2). On ppc64 and i486 the test passes both with the vanilla and the
> patched version.
>
> -FAIL: tmpdir-g++.dg-struct-layout-1/t026
> cp_compat_x_tst.o-cp_compat_y_tst.o execute
>
> I appreciate any clue regarding the reason this testcase fails (with
> Segmentation fault) on current mainline on x86_64; this could help me
> understand why the patch I'm working on caused it to pass.

These are generated testcases, see
gcc/testsuite/*.dg/compat/struct-layout-1*
If you build the testcase with -DDBG (e.g. changing the generator,
maybe --target_board unix/-DDBG, changing the struct-layout-1.h
header), then it should in g++.log print more details which exact test
failed. Then you can retry just with that single type that failed, say if
it was test 546, use just the
U(546,struct{char * b;}a;struct{}c[0];,F(546,a.b,(char *)&intarray[107],(char *)&intarray[95]))
line from testsuite/g++/g++.dg-struct-layout-1/t002_test.h
and if you can reproduce, you can preprocess/simplify as much as needed.

Jakub